Implement console color converters

[cebe]

Implement methods to convert:

• ANSI formatted string to HTML (for displaying console job output on websites)
• simple Markdown to ANSI formatted string to allow console color support in Console Controller action documentation which will be shown by HelpController

Therefore the following methods have to be reworked/refactored/merged:

• yii\helpers\ConsoleBase::ansiToHtml()
• yii\helpers\ConsoleBase::markdownToAnsi()
• yii\helpers\ConsoleBase::renderColoredString()
• yii\helpers\ConsoleBase::escape()

Console Color Support: #33

Further todo:

• implement strlen and strpad: https://github.com/tonydspaniard/php-cli-tools/blob/master/lib/cli/Colors.php#L133
• consider providing something like this: https://github.com/MichaelRFairhurst/I-feel-preTTY
• locallized console, help command and others could adopt to systems locale

[samdark]

Current ansiToHtml is PHP 5.4 only btw.

[cebe]

Why do you think that?

[samdark]

You're using self:: inside anonymous function.

[samdark]

@cebe what's left one this one?

[cebe]

Need to refactor all the conversion related functions, they do not really work in all cases.